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Using JQuery to control drop-down lists

炎欲天舞
Release: 2017-08-04 17:43:43
Original
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//遍历option和添加、移除option 
function changeShipMethod(shipping){ 
var len = $("select[@name=ISHIPTYPE] option").length 
if(shipping.value != "CA"){ 
  $("select[@name=ISHIPTYPE] option").each(function(){ 
   if($(this).val() == 111){ 
    $(this).remove(); 
   } 
  }); 
}else{ 
  $("<option value=&#39;111&#39;>UPS Ground</option>").appendTo($("select[@name=ISHIPTYPE]")); 
} 
} 


//取得下拉选单的选取值 

$(#testSelect option:selected&#39;).text(); 
或$("#testSelect").find(&#39;option:selected&#39;).text(); 
或$("#testSelect").val();
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///////////////////////////////// /////////////////////////////////////
If you have a bad memory, you can save it:
##1, drop-down box:


var cc1   = $(".formc select[@name=&#39;country&#39;] option[@selected]").text(); //得到下拉菜单的选中项的文本(注意中间有空格) 
var cc2 = $(&#39;.formc select[@name="country"]&#39;).val();   //得到下拉菜单的选中项的值 
var cc3 = $(&#39;.formc select[@name="country"]&#39;).attr("id"); //得到下拉菜单的选中项的ID属性值 
$("#select").empty();//清空下拉框//$("#select").html(&#39;&#39;); 
$("<option value=&#39;1&#39;>1111</option>").appendTo("#select")//添加下拉框的option
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A little explanation:
##1.select[@name='country'] option[@selected] means it has the name attribute,
And the attribute value is the option element with the selected attribute in the select element of 'country';
It can be seen that there are The one starting with @ means that what follows is an attribute.

2, radio button:

$("input[@type=radio][@checked]").val();   //得到单选框的选中项的值(注意中间没有空格) 
$("input[@type=radio][@value=2]").attr("checked",&#39;checked&#39;); //设置单选框value=2的为选中状态.(注意中间没有空格)
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3, Check box:

##
$("input[@type=checkbox][@checked]").val(); //得到复选框的选中的第一项的值 
$("input[@type=checkbox][@checked]").each(function(){ //由于复选框一般选中的是多个,所以可以循环输出 
   alert($(this).val()); 
   }); 

$("#chk1").attr("checked",&#39;&#39;);//不打勾 
$("#chk2").attr("checked",true);//打勾 
if($("#chk1").attr(&#39;checked&#39;)==undefined){} //判断是否已经打勾
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Of course jquery’s selector is powerful. There are many methods.

<script src="jquery-1.2.1.js" type="text/javascript"></script> 
<script language="javascript" type="text/javascript"> 
$(document).ready(function(){ 
$("#selectTest").change(function() 
{ 
       //alert("Hello"); 
       //alert($("#selectTest").attr("name")); 
       //$("a").attr("href","xx.html"); 
       //window.location.href="xx.html"; 
       //alert($("#selectTest").val()); 
       alert($("#selectTest option[@selected]").text()); 
       $("#selectTest").attr("value", "2"); 

}); 
}); 
</script> 


<a href="#">aaass</a> 

<!--下拉框--> 
<select id="selectTest" name="selectTest"> 
<option value="1">11</option> 
<option value="2">22</option> 
<option value="3">33</option> 
<option value="4">44</option> 
<option value="5">55</option> 
<option value="6">66</option> 
</select> 
jquery radio取值,checkbox取值,select取值,radio选中,checkbox选中,select选中,及其相关获取一组radio被选中项的值 
var item = $(&#39;input[@name=items][@checked]&#39;).val(); 
获取select被选中项的文本 
var item = $("select[@name=items] option[@selected]").text(); 
select下拉框的第二个元素为当前选中值 
$(&#39;#select_id&#39;)[0].selectedIndex = 1; 
radio单选组的第二个元素为当前选中值 
$(&#39;input[@name=items]&#39;).get(1).checked = true; 
获取值: 
文本框,文本区域:$("#txt").attr("value"); 
多选框checkbox:$("#checkbox_id").attr("value"); 
单选组radio: $("input[@type=radio][@checked]").val(); 
下拉框select: $(&#39;#sel&#39;).val(); 
控制表单元素: 
文本框,文本区域:$("#txt").attr("value",&#39;&#39;);//清空内容 
                $("#txt").attr("value",&#39;11&#39;);//填充内容 
多选框checkbox: $("#chk1").attr("checked",&#39;&#39;);//不打勾 
                $("#chk2").attr("checked",true);//打勾 
                if($("#chk1").attr(&#39;checked&#39;)==undefined) //判断是否已经打勾 
单选组radio: $("input[@type=radio]").attr("checked",&#39;2&#39;);//设置value=2的项目为当前选中项 
下拉框select: $("#sel").attr("value",&#39;-sel3&#39;);//设置value=-sel3的项目为当前选中项 
            $("<optionvalue=&#39;1&#39;>1111</option><optionvalue=&#39;2&#39;> 2222</option>").appendTo("#sel")//添加下拉框的option 
            $("#sel").empty();//清空下拉框 

获取一组radio被选中项的值 
var item = $(&#39;input[@name=items][@checked]&#39;).val(); 
获取select被选中项的文本 
var item = $("select[@name=items] option[@selected]").text(); 
select下拉框的第二个元素为当前选中值 
$(&#39;#select_id&#39;)[0].selectedIndex = 1; 
radio单选组的第二个元素为当前选中值 
$(&#39;input[@name=items]&#39;).get(1).checked = true; 
获取值: 
文本框,文本区域:$("#txt").attr("value"); 
多选框checkbox:$("#checkbox_id").attr("value"); 
单选组radio: $("input[@type=radio][@checked]").val(); 
下拉框select: $(&#39;#sel&#39;).val(); 
控制表单元素: 
文本框,文本区域:$("#txt").attr("value",&#39;&#39;);//清空内容 
$("#txt").attr("value",&#39;11&#39;);//填充内容 
多选框checkbox: $("#chk1").attr("checked",&#39;&#39;);//不打勾 
$("#chk2").attr("checked",true);//打勾 
if($("#chk1").attr(&#39;checked&#39;)==undefined) //判断是否已经打勾 
单选组radio: $("input[@type=radio]").attr("checked",&#39;2&#39;);//设置value=2的项目为当前选中项 
下拉框select: $("#sel").attr("value",&#39;-sel3&#39;);//设置value=-sel3的项目为当前选中项 
$("<option value=&#39;1&#39;>1111</option><option value=&#39;2&#39;>2222</option>").appendTo("#sel")//添加下拉框的option 
$("#sel").empty();//清空下拉框
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